From: Sam Leffler Date: Wed, 27 Jun 2012 19:55:56 +0000 (-0700) Subject: cpufreq: interactive: keep freezer happy when not current governor X-Git-Tag: firefly_0821_release~2958^2~296 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d00caa6461d6e4832999a9db21b55fb13d79c31a;p=firefly-linux-kernel-4.4.55.git cpufreq: interactive: keep freezer happy when not current governor Fix a problem where the hung task mechanism was deeming the interactive clock boost thread as hung. This was because the thread is created at module init but never run/woken up until needed. If the governor is not being used this can be forever. To workaround this explicitly wake up the thread once all the necessary data structures are initialized. The latter required some minor code shuffle. Signed-off-by: Sam Leffler Change-Id: Ie2c058dd75dcb6460ea10e7ac997e46baf66b1fe --- diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c index 20389918e66c..184140aabda2 100644 --- a/drivers/cpufreq/cpufreq_interactive.c +++ b/drivers/cpufreq/cpufreq_interactive.c @@ -953,6 +953,10 @@ static int __init cpufreq_interactive_init(void) pcpu->cpu_timer.data = i; } + spin_lock_init(&up_cpumask_lock); + spin_lock_init(&down_cpumask_lock); + mutex_init(&set_speed_lock); + up_task = kthread_create(cpufreq_interactive_up_task, NULL, "kinteractiveup"); if (IS_ERR(up_task)) @@ -968,14 +972,12 @@ static int __init cpufreq_interactive_init(void) if (!down_wq) goto err_freeuptask; - INIT_WORK(&freq_scale_down_work, - cpufreq_interactive_freq_down); + INIT_WORK(&freq_scale_down_work, cpufreq_interactive_freq_down); + INIT_WORK(&inputopen.inputopen_work, cpufreq_interactive_input_open); - spin_lock_init(&up_cpumask_lock); - spin_lock_init(&down_cpumask_lock); - mutex_init(&set_speed_lock); + /* NB: wake up so the thread does not look hung to the freezer */ + wake_up_process(up_task); - INIT_WORK(&inputopen.inputopen_work, cpufreq_interactive_input_open); return cpufreq_register_governor(&cpufreq_gov_interactive); err_freeuptask: